JPS605877B2 - Waste heat recovery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waste heat recovery apparatus, and in particular, to an apparatus for improving heat recovery efficiency by recovering latent heat of condensation from waste steam.

Generally, high-temperature gas or steam discharged from various chemical plants, steel plants, etc. is used, and the waste heat is recovered to preheat air or boiler water.

Conventionally, as shown in FIG. 1, for example, this waste heat recovery device has been provided with a vent pipe 1 through which cold air flows and a gas exhaust pipe 2 through which high-temperature exhaust gas flows below the vent pipe 1. 1 and a gas exhaust pipe 2 are thermally connected via a heat pipe 4 provided with fins 3. However, since the above-mentioned waste heat recovery device is designed to recover heat from non-condensable high-temperature exhaust gas, most of the waste steam 5 contained in this high-temperature exhaust gas is condensed on the surface of the heat pipe 4. Since the waste steam 5 is released into the atmosphere as it is, there is a problem in that it is difficult to efficiently recover heat from the waste steam 5, which has a relatively low temperature of about 100 to 13 pm. In addition, with this waste heat recovery equipment, waste steam containing harmful substances such as sulfuric acid, hydrochloric acid, and ammonia cannot be directly released into the atmosphere or sewage due to pollution problems, so these harmful substances must be recovered separately. There were disadvantages such as the need for equipment. As a result of various research conducted in view of these points, the present invention has developed a waste heat recovery device that efficiently recovers the latent heat of condensation, which accounts for most of the thermal energy present in waste steam, and eliminates the problem of pollution. This is what I did.

That is, in the apparatus of the present invention, a condensate tower 0 is provided at the bottom with an inlet for waste steam and a drain for discharging the condensed liquid, and a conduit through which low-temperature fluid flows is provided at the top of the condensation tower 0. are thermally connected via a vertically installed heat pipe, and the latent heat of condensation of the waste steam flowing into the condensing tube placed at the bottom is recovered to heat the low-temperature fluid flowing through the pipe line installed at the top. This is a waste heat recovery device that does this.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 2 shows an embodiment of the present invention, in which cold air is flown into the upper part of a condensing unit 9, which is equipped with an inlet 6 through which waste steam 5 flows in, and a drain 8 through which condensed liquid 7 is discharged to the outside. A ventilation pipe 1 for inflow is provided, and the condensed bonito 9 and the ventilation pipe 1 are connected to fins 3.
They are thermally connected via a heat pipe 4 provided with. zAlso, the heat pipe 4 is made of aluminum, copper,
The interior of a metal tube, such as stainless steel, is depressurized and a working fluid with a relatively low boiling point, such as water or alcohol, is sealed therein, and one end of the metal tube is used as a heat absorbing section 4a, and the other end is used as a heat radiating section 4b. The Z heat absorbing part 4a of this heat pipe 4 is provided so as to protrude into the condensate tube 9, and the heat radiating part 4b provided with the fins 3 is provided so as to protrude into the vent pipe 1, respectively. In the waste heat recovery device having the above configuration, when cold air is made to flow through the vent pipe 1 and waste steam 5 is supplied into the condensing water 9 through the inlet 62, heat exchange is performed via the heat pipe 4, and the waste heat is Waste heat in steam 5 is recovered.

To further explain this action in detail, the waste steam 5 supplied into the condensate rock 9 remains in the condensate column 9 without being exhausted, and the heat pipe 4 is kept at a low temperature. The liquid 7 touches the heat absorbing portion 4a, releases latent heat of condensation and condenses, and the condensed liquid 7 falls downward and is appropriately discharged to the outside through the drain 8. In addition, the 9 released at the heat absorption part 4a
The latent heat of condensation of the E steam 5 heats the working fluid in the heat pipe 34. Since the inside of the heat pipe 4 is in a reduced pressure state, the sealed working fluid absorbs the latent heat of vaporization and easily vaporizes, and this vaporized vapor rapidly rises to the heat dissipation section 4b.
reach. This steam is cooled by cold air in the heat radiation section 4b.
It touches the inner wall surface of the three pipes, releases latent heat of condensation, heats the cold air, and condenses here. The condensed working fluid falls again to the heat absorption part 4a side, and repeats the same action thereafter, rapidly increasing the temperature. It transfers heat to.
4 Fig. 3 shows an example in which the fluorocarbon turbine 11 is connected to the evaporator of a fluorocarbon turbine. The evaporation tube 13 is thermally connected to the condensate bonito 9 provided at the lower part of the evaporation tube 13 via a heat pipe 4 . This device uses waste heat recovered from waste steam 5 in a condenser 9 to evaporate liquid fluorocarbon 14 in an evaporation pipe 13 into high-pressure fluorocarbon gas 15, and guides this fluorocarbon gas 15 through a lotus pipe 12 to a fluorocarbon turbine 11. Here, the turbine is rotated to operate the generator 10.

In the above embodiments, the heat pipe is provided with fins on the side of the heat dissipation section, but the fins are not limited to this, and may be provided on the side of the heat absorption section or both sides.

Furthermore, when waste steam containing non-condensable gas is supplied into the condensate foundation, it is desirable to provide an air drain with a small hole in the wall of the condensate key. Next, specific examples of the present invention will be described.

In the waste heat recovery apparatus as shown in FIG. 2, a steel pipe with an outer diameter of 22.23 mm and a length of 80 ribs is used as a heat pipe, the inside of which is depressurized and water is sealed as a working fluid.

The upper half of this heat pipe protrudes into the ventilation pipe to serve as a heat radiating part, and the lower half protrudes into the condensed bonito to serve as a heat absorbing part. Further, in the heat dissipation part, a yellow steel strip having a width of 12 mm and a thickness of 0.2 mm is wound spirally with a pitch of 4 fences from its tip to a 35 mm length part to form a fin. A waste heat recovery device was constructed by attaching 80 heat pipes formed in this way, and 20 qo of cold air was delivered to the ventilation pipes at a rate of 1,000 qo per hour.
At the same time, condensate was finally supplied at a rate of 50 k9 per hour, and waste heat in the waste steam was recovered. As a result, the cold air supplied at 20:00 was 80℃.
It was confirmed that the waste heat was recovered very efficiently by being heated by hot air.

In order to compare with the above example, a conventional waste heat recovery device as shown in Fig. 1 was used and cold air was heated under the same conditions as in the above example. was 26°C, and the temperature increase was only 6°C, which was one-tenth of that according to the present invention.

As is clear from the above results, the waste heat recovery device according to the present invention has an extremely simple structure and can efficiently recover latent heat of condensation from relatively low-temperature waste steam that has not been used in the past. This method has remarkable effects such as being able to reliably condense waste steam containing harmful substances.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional waste heat recovery device, Fig. 2 is a sectional view showing an embodiment of the present invention, and Fig. 3 is an embodiment in which the present invention is applied to an evaporation pipe of a fluorocarbon turbine. FIG. 1...Vent pipe, 2...Gas exhaust pipe, 3
...Fin, 4...Heat pipe, 5...
Waste steam, 6... Inlet, 8... Drain, 9... Total condensate, 10... Generator, 11
...Front turbine, 13...Evaporation pipe. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A condensate can with an inlet for waste steam to flow in at the bottom and a drain for discharging the condensed liquid is arranged at the bottom, a pipe line for low-temperature fluid is installed at the top, and both are connected vertically. Thermal connection is made through a provided heat pipe, and the latent heat of condensation of the waste steam flowing into the condensing can placed at the lower part is recovered to heat the low-temperature fluid flowing through the pipe line provided at the upper part. A waste heat recovery device.